If you look at the ingredients for Alka-Seltzer, you will find that it contains citric acid and sodium bicarbonate (baking soda). When you drop the tablet in water, the acid and the baking soda react -- this produces the fizz.
Shake and Bake A new and increasingly widespread technique also known as one pot, this condenses the anhydrous method's many steps and requires only a plastic soda bottle, the size of which depends on the quantity of meth the cook intends to make.
Making Shake n Bake at home means that you will not get those nifty little bags for coating the meat in the breading mixture. No worries! I find that freezer bags work perfectly. I line my cookie sheet with aluminum foil so that the meat does not stick.